Leather-stitching machine



1. S. WENTWORTH. LEATHER smcmms MACHINE. APPLICATION FILED OCT. 19, 1916.

1,356,246, Patented Oct. 19,1920.

A TTORN/i y JESSE s. wnn'rwon'rn, 0 m, rumors.

LnA'rHEn-s'rrrcmue 'MACHINE. 7

Specificationof Letters Patent. v Patented 19, 1920.

Application filed October 19, 1916. Serial No. 126,596.

To all whom it may concern: Be it known that I, Jnssn S. WENTWORTH, a resident of Decatur, county of Macon, and State of Illinois, have invented certain new and useful Improvements in Leather-Stitching Machines, ofwhieh the following is a specification. I

My invention relates to improvements in leather stitching machines and has for its principal object the provision of an improved form of channel or groove forming mechanism.

Another obj ectis the provision of ajdevice or mechanism of this character which may be readily attached to machines of existing types without reconstruction or rearrangement. v i

A further object is the provision of such a mechanism wherein the groove or channel formingmember is moved positively while the work is held thereby giving most efficient results. r

Another object is form of presser ed to the usual presser foot lever and having a guide block secured thereto; a member slidably mounted therein and connected to the usual feeding segment casting and slide and having a groove orchannel forming member secured thereto and positioned in advance of the awl, so that when the awl isv returned to its normal position after puncturing and feeding, the groove or channel forming member is positively moved to operate on the material while thesame is being held to form the groove or channel in advance of the stitch. To the accomplishment of the foregoing and such other objects as may hereinafter appear. my invention consists in the construction, combination and arrangement of parts hereinafter described and then sought to be defined in the claims, reference being had to the accompanying drawings forming the provision of a new a part hereof and which shows merely for is formed with the horizontal extension 19 I having the reduced portion 20 forming the purpose of illustrative disclosure one embodiment of my invention attached to a stitching machine of the curved needle type, it being expressly understood that various changes may be'made inpractice within the scope of the claims without digressing from my inventive idea. e

.In the drawing, the figure represents a perspective view of a mechanism constructed according to my invention applied'to a machine of the curved needle type, the confoot adapted to be connectnections and operating parts being merely indicated, as they are of standard and well known construction.

In the construction of machine shown in the drawing to which the mechanism constructed according to my invention is applied l. designates the needle,2,. the awl,

actuated by segment 3 on casting 4, which is connected to slide block 5 which is moved to feed the material after the awlhas passed upwardly therethrough. In -the form shown, I disclose a curved needle stitching machine but it is to be expressly understood that myinvention is justas, readily adapted and applicable to a straight needle or other types of machines and that this disclosure is to assist in the explanation and not to limit my invention to the type shown.

The presser foot bar or lever 6 receives the presser foot vmember 7 whichis of peculiar form including the foot proper 8 having the long flat toe portion 9 and the shorter narrow toe portion 10 spaced apart to receive the needle and awl 2, which are operated inali nement with each other sothat the needle passes through the hole made by the awl and follows it on its do'wnward'movement. Of course itis to be understood that different forms of the presser foot are used depending upon the requirements of the work. i j

The presser foot member 7 is provided with the block portion having guideway 11 to slidably receive the holdingmember 12 as shown, take-up plate 13 being utilized in the guideway and having screws let for purpose of adjustment. The forward portion 15 of the holding member 12 is extended vertically as shown and is provided with the socket to receivethe groove or channel forming member or knife 16 having the binding .screw 17 and adjusting screw 18.

It is to be noted that the blade is positioned i just in advance of the needle and awl.

The other end of theholding member 12 shoulders on each side ,thereofand between whichis received the actuating bracket 21, havingslot 22 in itsend for this purpose. This bracket 21 is connected to the feeding segment casting. 4 so as to move therewith and has its relative position determined by adjusting screw 23, bearingagainst. said casting, the movement of the screw in or out, forcing the lever farther away from the V casting 4, or permitting it to move nearer to said casting. The slot 22 permits the rais ing and lowering of the presser foot without breaking the operative engagement between the blade holding member and the feeding segment casting l, which is reciprocated by the slide block 5 to feed the material, as is well understood. Therefore the blade is synchronously reciprocated with the awl.

The operation of the entire mechanism is as follows. The material is placed beneath the presse foot, locked by the usual handlock on the machine to which this device is attached and the machine started. The presser foot is then locked down and the awl moves upwardly through the material 24, and then the feeding mechanism operates to move the awl sidewise, the presser foot being released so that the material ca-nbe moved. It is then locked again and the needle follows the awl downward on its return movement and passes through the aperture made in the material, the thread beinglooped therearound. lVhile the needle is in the aperture the awl is moved to its normal position and the blade 16 cuts a channel or groove dircctly in front of the previously formed stitch, while the material is held at rest in a clamped position. The blade holding sliding block 12 is actuated by bracket 21 which is rigidly connected to the feeding mechanism and moves from side to side, in unison with the awl, so that when the awl is withdrawn from the material and passes back to its normal position, the cutting blade is then carried in a direction opposite to that direction in which the material is fed and does its cutting positively, step by step, as the material, from time to time, comes to rest.

This is just previous to the formation of the stitch. The carrying or the movement of the cutting blace in unison with the awl, enables the operator to position the iutting blade closer to the line of the awl, thereby making it much easier to have the stitch formed in perfect alinement with the chan nel or groove, and also making it much easier to turn the material While being stitched. The channel or groove being cut while the material is being held at rest in a clamped position, is a decided improvement due to the fact that the layers of the material are notseparated from each other, and thereby the operator is enabled to stitch the material more perfectly and rapidly. Further, should the cutting point of the blade have more of a bevel on one side than on the other, the material is not so easily forced out of stitching alinement due to the fact that the channel or groove is cut positively while the material is held at rest in a clamped position.

What I claim is, V

l. A mechanism of the character described, including in combination. a presser foot member, a groove or channel forming means and said mechanism slidably mounted relative to said presser foot memberand means for moving said groove or channel forming member relative to said presser foot to cuta groove or channel in the material.

2. A mechanism of the character de scribed, including in combination, a presser foot member, a block member slidably mounted therein having a blade held rigidly thereon and means for moving said block member so as to move said blade relative to said presser foot to cut a groove or channel in the material.

8. A mechanism of the character de scribed, including in combination, a presser foot having a groove or channel forming member movably mounted therein," feeding means, a connection between said feeding groove or channel forming member, so that t is operated in unison with the feeding means. 7

4-. A mechanism of the character described, including in combination, a presser foot member having a holding member movably mounted therein and a groove or channel forming member secured to said holding member, said holding memberhaving a connection with a feeding means so as tomove therewith to cut a groove or channel in the material. i

5. An attachment for leather stitching machines including apresser foot member adapted to be connected to the presser foot operating lever, said presser foot member having a groove or channel forming member movably mounted therein, said groove or channel forming member being adapted for operative connection to the feeding mechanism so that it-will be moved in unison therewith.

(5. i-ln'attachment for leather stitching machines including a presser foot member adapted to be connected to the presser foot operating. lever, said presser foot member having a guidcway, a holdingmembermovably mounted in said. guideway and having a groove or channel formingmember thereon, said holding member having an extension, an actuating bracket connected to saidextcnsion and adapted tobe connected to the feeding mechanism of the leather stltchmg machine so that the groove or channel formmg member is positively movedlate'rally in unison therewith, a

7. An attachment for leather stitching machines including a presser foot member adapted to be connected to the presser foot operating lever, said presser foot member having a guideway, a holding member movably mounted in said guideway and having a groove or channel forming member thereon, said holding member having an extension provided with spaced shoulders, an actuating bracket having a slot through which said extension passes, the shoulderspreventextension and adapted to be tion of said groove or machines including a presser foot member adapted to be connected to the presser foot operating lever, said presser foot member having a guideway, aholding member movably mounted in said an angled extension on one channel forming member end, a groove or mounted in said positioned in advance of the needle and awl, member being adapted for operative connection to the "feeding mechanism so that it will be moved in unison therewith.

9. An attachment for leather stitching machines including a presser foot member adapted to be connected to the presserfoot operating lever, said presser foot member having a guideway, a holding member movably mounted in said guideway and having a groove or channel forming member there on, said holding member having an extension, an actuating bracket connected to said extension and adapted to be connected to the feeding mechanism so that the groove or channel forming member is positively moved laterally in unison therewith and means for adjusting said actuating bracket to regulate the relative position of said groove orchannel forming member.

10. An attachment for leather stitching machines including a presser foot member adapted to be connected to'theqpresser foot operating lever, said presser toot member having a groove or channel forming member movably mounted therein, said groove or channel formin member being adapted for u z: u n operative connection to the feeding mechanism so that it will be moved in unison therewlth and means for ad usting the posimember.

11. A mechanism of the character described, including in combination, a presser foot member, a holding member slidably mounted therein in the direction of the guideway and having saidholding channel forming movement of the work, means for moving said holding member, a groove or channel forming member mounted in said holdin member and means for adjusting said groove or channel forming member.

12. A mechanism of the, character described, including in combination, a presser foot member, a holding member slidably mounted therein in the direction of the movement of the work, means said holding member, a groove or channel forming member mounted in said holding member and means for adjusting the depth of said groove or channel forming member and means for adjusting its positionrelative to the needle.

13. An attachment for leather stitching machines including a presser foot member adapted to be connected to the presser foot operating lever and having the presser foot proper formed with an elongated slot, said for moving presser foot member having a groove or a channel "forming member movably mounted therein and adapted for operative connection to the feeding mechanism of the leather stitching machine so that it will be moved in unison therewith,

adapted to move in said slot in the "presser foot proper in line with the movement of the work. a

14. An attachment for leather stitching machines including a presser foot member adapted to be connected to the operating lever of the machine, said presser foot member being provided with a guide- WW said guideway and having an extension, a blade member mounted in said extension, said presser foot foot proper provided with an elongated slot in which said blade member is positioned and adapted to move, said being adapted for operative connection to the feeding means so that it will be moved in unison therewith andthe blade member will operate to cut a groove or movement.

' JESSE S. WENTWORTH.

said groove or channel forming member having a kmfe located and I presser foot a holding member slidably mounted in member having the presser channel in the materialfin the direction of its path of l 

